cover
noun
1.
a covering that serves to conceal or shelter something
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cover 3.
the act of concealing the existence of something by obstructing the view of it
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cover 4.
the protective covering on the front, back, and spine of a book
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cover 5.
a natural object that covers or envelops
7.
fire that makes it difficult for the enemy to fire on your own individuals or formations
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cover 8.
a fixed charge by a restaurant or nightclub over and above the charge for food and drink
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cover 9.
a recording of a song that was first recorded or made popular by somebody else
10.
a false identity and background (especially one created for an undercover agent)